Corp is ridiculously cheap, I can never remember exactly how much it is, but a double vodka and mixer before midnight is something like £1.40 and a quad vodka is something daft like £2.50 ish. After midnight I think everythin goes up by a pound, and its a few pound for entry. However, it is an acquired taste and it differs depending on what day of the week you go.

Other than that, leadmill has 80p drink nights, and viper rooms on a wednesday is something like £2 for a double vodka and mixer.